Saturday's fundraiser will help the family of the girl who was killed instantly when a big rig collided with the motorcycle she was on

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Breann Creer, 4, was killed Aug. 27. She was a passenger on a motorcycle that collided with a big-rig truck.

Motorcyclists and bikers are banding together to help the family of a 4-year-old girl who was killed in a motorcycle crash this week.

Breann Creer of Ontario was the passenger of a motorcycle that collided with a big-rig truck in Rancho Cucamonga on Tuesday, according to the San Bernardino County Sheriff-Coroner Department. She was pronounced dead at the scene.

After the crash, two motorcyclist groups organized a fundraiser for Creer's family.

The Biker Network and the Fallen Riders Foundation will hold a fundraiser motorcycle and car wash on Saturday, 10 a.m. to 4 p.m. at Citizens Business Bank Arena, 4000 East Ontario Center Pkwy in Ontario, 91764.

Those who can't make the event can donate funds to the Breann Creer Wells Fargo Donation Account No. 3344876523.

The deadly crash occurred before 11 a.m. on Tuesday.

Sheriff's detectives said the motorcycle and big rig were both heading east on 6th Street near Hermosa Avenue when the truck suddenly made a U-turn in front of the motorcycle.

Witnesses said the driver of the truck apparently did not realize the crash had occurred and continued going forward and in reverse with the motorcycle underneath it as it tried to negotiate the tight turn.

Witnesses screamed at the truck driver to stop.

"I ran and checked the baby's pulse. There was nothing," said Cheri Slocumb, who witnessed the crash and recalled the words of the man who was on the motorcycle with the child. "He kept saying, 'I'm so sorry, I'm so sorry. Breathe, baby.'"

The driver of the Harley-Davidson sustained moderate injuries and was taken to the hospital.

He and the girl, who was wearing a motorcycle helmet, were not related, and it was unclear how they knew each other, investigators said.

Jeff Swain said the driver of the motorcycle is a combat veteran. Swain was surprised to hear the girl was on the back of the motorcycle.

"There's no place for a 4-year-old on a motorcycle," Swain said.

The truck is owned by a company called Finetrans, which is based in Georgia. Its driver and passenger were interviewed by investigators.

"I really think if he had not run over the baby, they would have been OK," Slocumb said.

Investigators said state law does not have age restrictions for motorcycle passengers.